Worry is a cycle. First you worry about a person or thing. You ruminate on that for awhile until you feel your heart beat and panic, panic, panic. Then you realize that worrying is unhealthy and you start to worry about worrying.
So you try to stop worrying, because it's unhealthy. Then you start worrying about trying to STOP your worry, because they you won't be ready for the doom that you just KNOW is going to occur.